nixpkgs/pkgs/development/tools/scalafmt/default.nix

{ lib, stdenv, jdk, jre, coursier, makeWrapper }:

let
  baseName = "scalafmt";
  version = "3.4.0";
  deps = stdenv.mkDerivation {
    name = "${baseName}-deps-${version}";
    buildCommand = ''
      export COURSIER_CACHE=$(pwd)
      ${coursier}/bin/cs fetch org.scalameta:scalafmt-cli_2.13:${version} > deps
      mkdir -p $out/share/java
      cp $(< deps) $out/share/java/
    '';
    outputHashMode = "recursive";
    outputHashAlgo = "sha256";
    outputHash     = "l5F09bjRev2eBHKTMzojC7+USkW7qf3YtA2KSoN7MxM=";
  };
in
stdenv.mkDerivation {
  pname = baseName;
  inherit version;

  nativeBuildInputs = [ makeWrapper ];
  buildInputs = [ jdk deps ];

  dontUnpack = true;

  installPhase = ''
    runHook preInstall

    makeWrapper ${jre}/bin/java $out/bin/${baseName} \
      --add-flags "-cp $CLASSPATH org.scalafmt.cli.Cli"

    runHook postInstall
  '';

  installCheckPhase = ''
    $out/bin/${baseName} --version | grep -q "${version}"
  '';

  meta = with lib; {
    description = "Opinionated code formatter for Scala";
    homepage = "http://scalameta.org/scalafmt";
    license = licenses.asl20;
    maintainers = [ maintainers.markus1189 ];
  };
}